And Betsy Woodruff explains in the report, there’s a potential snag here for the Trump administration should Mueller want to pursue charges:

As special counsel, Mueller is subject to the same rules as U.S. Attorneys. That means that if he wants to bring charges against Trump associates related to violations of tax law, he will need approval from the Justice Department’s elite Tax Division. Trump hasn’t yet named his pick to run the division, which is a post that requires Senate confirmation. At the moment, career officials are helming the division.

One former Tax Division prosecutor told The Daily Beast that this could cause trouble for Trump.

“The fact that there is not a senate-confirmed Assistant Attorney General for the Tax Division, and that the Trump people have disregarded it despite warnings as far back as December that they needed to fill the AAG’s spot… shows what a self-created mess the Trump administration has found itself in,” said the former prosecutor, who requested anonymity to speak candidly. “They have no one to keep Mueller and his Brooklyn team honest. They should be concerned about that.”

There was reporting a few weeks ago that Mueller was looking into “Trump and his associates’ financial ties to Russia.”